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Hi folks, I am in the process of purchasing a vintage speedster. Unknown build date, but appears to be very nice. I have a couple of air cooled porsches, and just rebuilt a Meyers dune buggy for a client.  The markings on the engine of this speedster have me stumped. I will try to post a pic to see if anyone knows anything about the engine builder. Most of the stamped letters make sense. I don't know what the RMM is or deep plugs???  Any insight would be appreciated!Screenshot_20211022-111245_Chrome

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dlear/476......They are stamped. If cast in they would have shadowed casting marks around the data from the "casting slugs" used to make them and allow them to be changed at will by the foundry. Casting slugs look very much like the lead ones used by printers when they "set type" but they are made of harder metal than lead that won't wear out.  

Something I have always wished is that all replacement parts have the actual part number of that particular part stamped, engraved, or whatever method worked best permanently written on each part. That would certainly make things easier later..........Bruce

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